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850 cam timing

  • Thread starter Thread starter veedub
  • Start date Start date
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veedub

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I have a 79 GS850 that I just cant seem to get running no matter what I try. I want to check to make sure the chain didn't somehow jump time. I read my manual on how to check cam timing with the counting of 20 pins. My question is with the valve cover off can I just unbolt the little idler pulley (evenly a bit at a time on each corner) make the check and bolt it back on or is there more I need to do to take this off?
 
Are you getting gas, spark, compression?
To change the cam timing you'll need to lock and take off your cam chain tensioner under the carbs. You'll also need to take the cam caps off.
Reread your post
Yes you can take off the valve cover to check the timing.
Make sure you're on TDC for the #1 and #4. The #1 arrow needs to be facing the surface of the front of the head.
 
chef1366 said:
Are you getting gas, spark, compression?
To change the cam timing you'll need to lock and take off your cam chain tensioner under the carbs. You'll also need to take the cam caps off.
Reread your post
Yes you can take off the valve cover to check the timing.
Make sure you're on TDC for the #1 and #4. The #1 arrow needs to be facing the surface of the front of the head.
Click to expand...
True, but to check the timing, you will only need to remove the ignition cover on the right end of the crank (so you can turn the crank), remove the cam chain tensioner (easier to take off the carbs, too), then remove the idler sprocket.

If you need to actually change the timing, you will need to remove cam caps.

While you have everything apart, this is the PERFECT time to check valve clearances and the o-rings on the intake boots, as well as assuring proper function of your cam chain tensioner.

.
 
Steve said:
True, but to check the timing, you will only need to remove the ignition cover on the right end of the crank (so you can turn the crank), remove the cam chain tensioner (easier to take off the carbs, too), then remove the idler sprocket.

If you need to actually change the timing, you will need to remove cam caps.

While you have everything apart, this is the PERFECT time to check valve clearances and the o-rings on the intake boots, as well as assuring proper function of your cam chain tensioner.

.
Click to expand...

Steve, he's got a '79 so he can use the kick starter to turn the crank. Another advantage to having one!
 
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